Part 75-4D Piles, steel-core piles and micropiles. Static test loadings. TNa micropiles.

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Presentation transcript:

Part 75-4D Piles, steel-core piles and micropiles. Static test loadings. TNa micropiles and anchors. Test trials in Sundsvall II/2013, modified 11/2016 (Part 75-4, PP 2007, animation+p/r : 2016.11.10 compr.) Copyright notice Unauthorised copying of this presentation as whole or in parts in any form or by any means, electronic, photocopying, recording or otherwise, without prior written permision is prohibited. ready

s = stotal = (sB + ΔLfree) = (f) load ks = (time, load) press press press ready s = stotal = (sB + ΔLfree) = (f) load

Test Expander Body micropiles Ø 400 mm ks = (time, load) ΔP= (f) constant load Test Expander Body micropiles Ø 400 mm ks = (time, load) press ready

Test TNa micropile Ø 400 mm ks = (time, load) ΔP= (f) constant load Test TNa micropile Ø 400 mm ks = (time, load) ready

ks [mm] Axial pile load ready

ks [mm] Axial pile load ready

Safety factor Pactual /Pbearing capacity ks [mm] Safety factor Pactual /Pbearing capacity press ready

s = stotal = (sB + ΔLfree) = (f) load Axial pile load s = stotal = (sB + ΔLfree) = (f) load sB = (f) load [??? ] press ??? s = (f) load ready

– assessment from elongations measured during loading tests Axial pile load Eskaft, Ebody, Epile – assessment from elongations measured during loading tests ready

Eskaft, Ebody, Epile [???] Δlfree = (f) load [??? ] press ready

ΔP foundation = (f) load [??? ] Axial pile load ready

Test Expander Body micropiles Ø 400 mm Axial pile load Test Expander Body micropiles Ø 400 mm Axial pile load Axial pile load Test TNa micropile Ø 400 mm Axial pile load % ΔPfoundation, % ΔPskaft (core), % ΔPbody (friction), % ΔPpile tip = (f) load press press ready press

Pskaft (core)= (f) load Ԏ [kg/cm2] Axial pile load Pskaft (core)= (f) load press press ready

% ΔPbody (friction)= (f) load Ԏ [kg/cm2] “steel/soil area” Axial pile load % ΔPbody (friction)= (f) load press press press ready

δ [kg/cm2] Ԏ [kg/cm2] Ppile tip = (f) load Axial pile load press press ready

Pskaft (core), Pbody (friction)= (f) sp press press press ready

Pskaft (core), Pbody (friction)= (f) sp Ԏ [kg/cm2] press ready press sp [mm] press

Ppile tip = (f) sp δ [kg/cm2] press press ready sp [mm]

SOILEX and TNA earth anchor body – max skin friction between expansion bags and the soil Skin friction 350 kPa 80 kPa Axial pile load ready

Thank You for Your attention! THE END of Part D Thank You for Your attention! ready

Welcome to www.najder.se ready